中文摘要：

NiAlTiCTiB <潜水艇class=“ a-plus-plus ”> 2 composites 被自我繁殖的高温度的合成( SHS )处理用 Ni 的未加工的粉末的方法，艾尔， Ti ， B <潜水艇class=“ a-plus-plus ”> 4 C ， TiC ，并且 TiB <潜水艇class=“ a-plus-plus ”> 2 ,和他们的微观结构并且微坚硬被调查。TiCTiB < 潜水艇 class= “ a-plus-plus ” > 与从 10 ～ 30 wt% 的内容，在 NiAl 矩阵的 2 与二个方法的使用出现了：在形成并且外部地增加了的 situ。所有最后的产品由三组成的结果表演 NiAl， TiC，和 TiB 分阶段执行 < 候补选手 class= “ a-plus-plus ” > 2 。NiAlTiCTiB 的微观结构 < 潜水艇 class= “ a-plus-plus ” > 2 composites 与在形成 situ 的 TiC 和 TiB < 潜水艇 class= “ a-plus-plus ” > 2 好，并且所有三个阶段一致地是分布式的。在 composites 的 NiAl 矩阵的谷物极大地被精制了，并且从 381 HV 的 NiAl 增加微坚硬 < 潜水艇 class= “ a-plus-plus ” > 100 到 779 HV < 潜水艇 class= “ a-plus-plus ” > 100 。然而， NiAlTiCTiB 的微观结构 < 潜水艇 class= “ a-plus-plus ” > 有外部地增加的 TiC 和 TiB 的 2 composites < 潜水艇 class= “ a-plus-plus ” > 2 粗糙、不同类，与 TiC 和 TiB 的严重凝块 < 潜水艇 class= “ a-plus-plus ” > 2 个 粒子。外部地包含的样品增加了 30 wt% TiCTiB < 潜水艇 class= “ a-plus-plus ” > 2 到达 485 HV 微坚硬 < 潜水艇 class= “ a-plus-plus ” > 100 。二种 NiAlTiCTiB 的微观结构进化和破裂模式 < 潜水艇 class= “ a-plus-plus ” > 2 composites 是不同的。

英文摘要：

The NiAl–TiC–TiB2 composites were processed by self-propagating high-temperature synthesis（SHS） method using raw powders of Ni, Al, Ti, B4 C, TiC, and TiB2, and their microstructure and micro-hardness were investigated. The TiC–TiB2 in NiAl matrix, with contents from 10 to 30 wt%, emerged with the use of two methods： in situ formed and externally added. The results show that all final products are composed of three phases of NiAl, TiC, and TiB2. The microstructures of NiAl–TiC–TiB2 composites with in situ-formed TiC and TiB2 are fine, and all the three phases are distributed uniformly. The grains of NiAl matrix in the composites have been greatly refined, and the micro-hardness of NiAl increases from 381 HV100 to 779 HV100. However, the microstructures of NiAl–TiC–TiB2 composites with externally added TiC and TiB2 are coarse and inhomogeneous, with severe agglomeration of TiC and TiB2 particles. The samples containing externally added 30 wt% TiC–TiB2attain the micro-hardness of 485 HV100. The microstructure evolution and fracture mode of the two kinds of NiAl–TiC–TiB2 composites are different.